Air-cooled transformer



J. BURKE.

AIR COOLED TRANSFORMER. APPLICATION FILED Nov. 6. 1919.

1,427,783.- l atentedS'ept. 5, 1922.

61 many Patented Sept. 5, 1922.

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' 7 Application Filed 'november 6, 1919.; Seria1No.' 336,215.

v T all whom it/ may come m:

Be it known that I, JAMEs BURKE, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and Useful Improvements in Air-Cooled Transfornr ers, of which the following is a specification. v

This invention relates to electrical transformers and particularly to means for cooling the same. The object of the invention is to provide apparatus supplying the transformer with cooling currents of air in simple and inexpensive manner and distributing it among the parts in even and uniform man ner.

In the accompanying drawings the invention is illustrated in connection with a transformer having a plurality of magneticcircuits and with its core in a horizontal plane p but it is understood" that the invention may carry be used in connection with other transform- 'ersand is not confined to the specific example shown and described.

In the accompanying drawings:

Fig. 1 is a vertical end View of a transformer construction illustrating one embodiment of the invention with portions broken away to illustrate the construction within, and

Fig. 2 is a horizontal sectional view taken on line 2-2 of Fig. 1.

In the embodiment of the invention shown a core 5 of laminated constructionhas lute"- mediate legs 6 forcoils 7 of the high and low tension windings. The core 5 is gripped between beam members 8 above and 9 below and thesemembers are pressed toward each other by nuts 10 of screw rods 11 passing through the webs of channel beams 12 and the flanges of I-beams 13. Tie rods 1r draw the channel beams 12 toward each other and tie rods 15 similarly connect the I-beams 13 and the whole transformer construction is sustained by supporting means engaging under the protruding ends of I-beams 13,

The screw rods 11 are carried upward above the beams 12 and at their upper ends longitudinal strips 16 for supporting the high tension and low tension leads to the coils 7. Around the transformer is formed the sheet metal casing 20 comprising the rectangular portion 21 and tapered funnel portion 22'. The upper rectangular portion 21hugs closely to the outline of the transformer core parts and extends for a considerable distance above, thus housing a and protecting them. The lower funnel por tion terminates in a bottom plate 23 having a central opening 24. A centrifugal fan wheel 25 surrounds this opening and draws air therethrough downward and discharges 1t outward, the fan motor 26 being supported by straps 27 from thefunnel portion 22 of a the casing.

The coils arespaced apart sufiiciently to provide air spaces 30 betweenthem and through thesespaces the air is circulated downwardrby the suction of fan 25. The fan motor is preferably designed to run fromthe' low tension circuit connected to the transformer so that the fan automatically stops and starts as thetransformer is disconnected or connected. The fan suction is so spaced from the coils thatthe drop in pressure and circulation of air is uniform in all the air spaces, producing an even and efficient cooling.

The cooling means of this invention is 1 simple in form and easily applicable to many existing transformers. In order to provide an air cooled transformer with the forced circulation of thisinvention it i is onl necessary to build the surrounding casing and connect the exhaust fan and motor unit which may advantageously be marketed as a standard part.

I claim a a i 1. The combination of a transformer having a core and coils and vertical air passages between the coils, a casing surrounding the core and coils on the sides and open at one end, and means closing the opposite end of said casing comprising a centrifugal fanwheel for drawing the air through the coverlng an opening at the other end of the transformer from the open end of the cascasing, and an electric motor outside the said wheel for driving said wheel, and therefrom the open end of the casing.

3. A combination of a transformer having by drawing air through said transformer ing a core and coils, the coils having air passages between them, a casing surrounding the sides of the transformer and having an open end and having a converging extension with a smaller opening at the i opposite end, a centrifugal fan Wheel covering said opening, and an electric motor for driving said Wheel located outside said Wheel and supported from said extension,

' JAMES BURKE. 

